Bushing



May 11, 1 948. 7 J. N. BROWNING 2,441,467

BUSHING Filed May 28, 1947 INVENTOI? Johw N. BROWNING ATTORNEYS PatentedMay 11 1948 v S PAT BUSHING I v John N. Browning, Maysville, Ky.assignor to Browning Manufacturing Company, Inc.,'

Maysville, Ky., a corporation of Kentucky Application May '28, 1947,Serial No. 751,057

3 Claims. (Cl. 28752.06)

The invention relates to novel and improved bushings adapted to serve asintermediate elements between, for example, a shaft and a sheave, gear,or pulley rotatable with the shaft.

In such assemblies the function of the bushing ing of novel, simple, andefficient structure which permits rapid and positive attachment anddetachment of the hub of a pulley or other device onashaft. 1

Another object of the invention is to provide a bushing of the typedefined in the last preceding paragraph, the bushing being provided with'novel' means adapted either to apply the hub and bushing to the shaftor to detach the same fromthe shaft.

Further objects of the invention in part are obvious and in part willappear more in detail hereinafter.

In the drawings, Fig. 1 is an end elevational view of an assemblycomprising a shaft, bushing, and sheave; Fig. 2 is a vertical sectionalview taken on the line 2--2 of Fig. 1; Fi 3 is a view similar to Fig. 1but showing a slightly modified embodiment of the invention.

In the embodiment of the invention shown in Figs. 1 and 2 I haveconventionally shown a fragmentary portion of a motor I from which astub shaft ll extends. A sheave I 2 provided, in the present instance,with a pair of V belt grooves lZa is retained on the stub shaft by atubular bushing l3 now to be described. It will be obvious to thoseskilled in the mechanical arts that a pulley, wheel hub, or otherappliance may be substituted for sheave [2 as long as it is adapted tobe affixed to the shaft I I.

The bushing I3 'is of course telescopingly mountable on the shaft, andits inner bore I5 is made slightly oversize for easy application to theshaft. The bushing however is adapted to be resiliently contractable togrip the shaft by reason of a slot l6 extending completely through thebushing along its full length.

The outer surface I! of the bushing and the inner surface I8 of thesheave hub are tapered to complementary angles, and it will be apparentthat when the bushing is telescopingly assembled on the shaft and thesheave is telescopingly assembled on the bushing, forcible advance ofthe sheave on the bushing produces concentric contraction of the bushinginto tight contact with the shaft.

. I have provided novel means for drawing the sheave onto the bushing asaforesaid, said means being cooperative with a special surf-ace featureof the bushing. The end portion l3a1of the bushing, outwardly beyondcontact with the sheave bore, isprovided with aperipheralgroove 20 (Fig.2). The'outer endof sheave" I2 has a pairgof diametrically'opposedapertures 21, suitably threaded to receive :the threaded, shanks of arespective pair of collarjscrews 22,'this'terminology being selected todenotethat each screw is provided at its neck portion with a peripheralflange 22a, a portion of which is .seatable in groove".

The assembly and operation .of the device will now be apparent.- Withthesheave and bushing disassembled; and removedfrom the shaft, thesheave is telescopinglyi advancedon the bushing until its end facecontacts the threaded shank ends .of the colla'rrscrews which'havebeenpreviously placed in readiness with? their flange portionsin groove 20LThe sheave and'bushing. are relatively rotated until the screw shankscome into alignment with apertures 2| in. the sheave. After a few screwturns to catch the threads, but before the bushing has been radiallyreduced sufilciently to prevent its application to the stub shaft, theassembly is disposed on said shaft at the proper place, and the screwsare again turned. In this operation the screw serves as drawing-upmeans, pulling the sheave onto the bushing and simultaneously tighteningthe bushing on the sh'aft.

If it be desired to remove the assembly from the shaft, rotation of thescrew in the opposite direction forces the sheave from the bushing,Permitting the split bushing to expand sufiiciently for such removal.

It will be apparent that all effort required in assembling the sheave onthe bushing, or removing it therefrom, is applied by means of the collarflange 22a on one or other transverse wall 'of the groove 20. Inprevious devices of this nature other and more complex systems have beenused for assembling the respective parts, and for disassembling them.This is the first instance known to me wherein the same instrumentality,namely the collar screws and surface groove, is used for bothoperations.

A slightly modified embodiment of the invention is shown in Fig. 3. Inthis embodiment four collar screws provide doubled potentiality for theapplication of force to unite or separate the sheave and bushingassembly on the shaft H. The continuous groove 20 permits any suitablewith an axial bore, said |bore being tapered so as to be complementaryto, and receivable upon, the i scribed comprising, in combination, abushing tapered outer surface of the bushing body, an external surfaceportion or "said base having. a slot adjacent to, and in a planeparallel to; the end face of said hub, said end face having a threadedaperture, a screw seated insaid' aper fl ture and rotatably advanceableand retractable V therein, said screw having a transverse flangeextendable into said slot, whereby rotation of said screw forces siaidflaiifge against th'e'wall r said slot in the direction of screw travel;so as toprddu'ce relative'movement between the complementarytaper'e'ds'urfaces of the hub and the bushing. l I

2. A shaft-mountable limit of the character de-- scribed comprising, in"combination, a bushing external surface portion of said'ib'ase'having aslot adjacent to, and ina plane'rpa'rallel to, the end face of saidhub,-'s'aid sl'ot' exten'di'ng peripherally completely around said base,-said end face of said hub bin'g' providedwithv a plurality of threadedapertures spaced-' circumferentially therearound, and disposed slightlyradially outwardly from the hub bore so as to be adjacent the base ofsaid bushing, a plurality of screws disposed one in each aperture androtatably advanceable and retractable therein, each such screw having atransverse flange extendable into said slot, whereby rotation of saidscrews forces their respective flanges against the wall of said slot inthe direction of s ew travel, so as to produce relative movement betweenthe complementary tapered surfaces of the bushing and the hub.

113. A shaft-mountable unit of the character -deiavin g an; xial'boreadapted to receive a shaft, saidflbushi'ngbeing of sleeve like characterand having a base, and a body provided with anexterna'l"suriaceiconically tapering away from said base a machineelement having a hub provided with an axial bore, said bore beingtapered so as to be complementary to, and receivable upon, the taperedouter surface" of the bushing body, arr external surface p-orti'onofsaid base having a s'lot ad'jac'ent to, and'in' atpl'ane' parallel to,the end face of saidh'ub, :said. end; face'having a threaded aprture a:'screWJseat'e'd in saidapertui'e andi'rotatably advanceablearrdretractable relative endwisemovement of said-hub on said bushingcauses-contraction or permits expansion of the bushing dependent uponthe'direction of suchmovement."

r JOHN-N. BROWNING.

